i replaced my thermostat in my EF 6cyl couple months ago, and fitted it along with a gasket for the housing. Now it leaks.

so i went to Fraud and asked them for a better gasket, and they told me you dont use a gasket around the housing where it bolts together, as the thermostat already has a rubber seal and me using the surrounding gasket is why its leaking.

i asked them why the f**k does repco sell the housing gasket and they shrugged their shoulders.

....ssooo do i just use the thermostat with the rubber seal on its own, or do i also use the paper gasket the sits between the two pieces that surround the thermostat?

I've also had problems with aftermarket thermostat gaskets leaking. I think they're made in China, so there's a problem to start with. They seem to disintergrate after a while.

The best stuff to use is brown gasket paper you buy from Repco, etc. Make your own gasket and use silicon sealant as well. Also keep the rubber gasket around the thermostat. I've tried the gasket making silicon but that didn't work well (for me).

When fitting a new rubber t'stat seal, file flat the water neck and the housing. If been mucked around with before, people tend to over do the bolts and warp the housings.You do NOT need to use any sealant of any kind. Rubber seals best on clean, dry, flat surfaces.Don't forget to put an 1/8" hole in the t'stat....this helps stop heat shock at the radiator.

I only use the rubber seal for the thermostat and then just smear a little bit of the blue gasket stuff, seems to work well havent had a leak ever since i replaced the thermostat last year. Just make sure that both mating surfaces are clean etc..

To be honest i never even knew that there was supposed to be a gasket between the upper and lower thermostat housings lol. Even the full VRS gasket kit i bought when i did the head gasket didnt even include one, only the one for betwen the lower housing and head and the rubber seal around the thermostat were in the kit

i spent $30 on this thermostat so i wanna only do it once and have it seal properly. Ok so i will try it without the gasket and rely on the rubber seal from the thermostat...... if it leaks, then i blame Krytox

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